How to Calculate kVA

To calculate kVA, we need to know two of the three values of kVA, Volts and Amps. For three phase kVA calculations we also need to know the Power Factor and kW values.

There are a number of kVA formulas which maybe difficult to remember, in which case you may like to download our kVA Calculator for iOS and Android.

Single Phase kVA Calculations

This section explains how to carry out single phase kVA calculations.

Convert kVA to Amps

To calculate Amps from kVA we use the formula, Amps =  kVA  x 1000 / Volts.

For example, If kVA = 4.6 and voltage = 230 then the calculation is 4.6 (kVA) x 1000  / 230 (V) = 20 Amps.

Convert Amps to kVA

To calculate kVA from Amps we use the formula, ​kVA = Amps x  Volts / 1000.

For example, If Amps = 15 and Volts = 120 the calculation is 15 (A) x 120 (V) / 1000 = 1.8 kVA.

Three Phase kVA Calculations

This section explains how to carry out three phase kVA calculations.

Three Phase kVA to Amps

To convert kVA to Amps three phase we can use this formula, Amps =  kVA /  Volts / 1.732 x 1000.

For example, if kVA = 50 and volts= 400 then the calculation is, 50  (kVA) / 400 (V) / 1.732 * 1000 =  72.17 Amps.

Three Phase Amps to kVA

To calculate Three Phase kVA from Amps the formula is, kVA = Amps x Volts x 1.732 / 1000.

For example, if Amps = 25 and volts = 400, then the calculation is 25 (A) x 400 (V) x 1.732 / 1000 =  17.32 kVA.

kVA to kW to Power Factor

To calculate to or from kVA, kW or Power Factor there are the following calculations,

kVA = kW / Power Factor
For example, if kW = 5 and Power Factor = 0.8, then kVA =  5 (kW) / 0.8 (PF) = 6.25 kVA.

kW = kVA x Power Factor
For example, if kVA = 14 and Power Factor = 0.7, then kW = 14 (kVA) x 0.7 (PF) = 9.8 kW.

Power Factor = kW / kVA
For example, if kW = 15 and kVA = 25, then Power Factor = 15 (kW) / 25 (kVA)= 0.6 PF.

When calculating kVA, kW or power factor, select the relevant calculation formula from above, alternatively you can download the kVA Calculator App for your mobile device.